Suppose the mass of a single $Ag$-atom is $m$. $Ag$ metal crystallises in $fcc$ lattice with unit cell of length $a$. The density of $Ag$ metal in terms of $a$ and $m$ is
- A$\frac{4 m}{a^{3}}$
- B$\frac{2 m}{a^{3}}$
- C$\frac{m}{a^{3}}$
- D$\frac{m}{4 a^{3}}$
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